Is it far for human beings to leave other planets to live?

I estimate that it is difficult to achieve large-scale immigration within a hundred years. Now discuss the steps and time of emigration to other planets.

The first step is to find a planet suitable for human habitation, life and development.

There are too many indicators, it's not that simple.

The layman gives some indicators:

1, planetary gravity. Mainly, humans can at least walk freely on it. We can't let the gravity be too strong, so that human beings can't breathe, and we can't accidentally fly into space. 2. Air quality. That is, the oxygen content is suitable for human survival. For example, oxygen should meet the standard, and other gases in the air have no obvious harm to the human body. There are no creatures on this planet that humans can't subdue or avoid, such as wild animals. This planet can produce the minimum food needed by human beings, such as grains, vegetables, fruits, raw materials for clothes, meat and so on. Humans can reproduce normally on this planet. 6. Weather conditions. 7. Mineral deposits.

Nowadays, people know very little about the nearby planets.

1, just landed on the moon several times, and each time it was a turn within one kilometer. Because the United States and the Soviet Union didn't know what they found on the moon, they stopped for half a century.

2. Do you know the earth polar expedition? This survey has been carried out for decades and should be a comprehensive result. When will such an expedition to the moon and other planets begin? I've been watching it for more than ten years. After the inspection, it will take at least half a century's work. After the work, it can be concluded whether this planet is suitable for human reproduction. Or how many places are suitable for human reproduction, that is to say, there are also places on earth that are not suitable for human reproduction. Other planets may be similar. Or it is not suitable for human beings, but it can provide some useful and cost-effective resources for human beings.

Second, the second step, the actual experimental stage.

When scientists come to the conclusion that a planet is suitable for human reproduction, it can only be a theoretical judgment, and a long physical experiment is needed. Similar to the vaccine experiment, it is graded in several stages.

1, the first issue. At least two warriors (a man and a woman) are willing to do experiments and use spacecraft for decades. For modern people, there should be no shortage of such warriors. If it goes well in ten years, there should still be people applying to be guinea pigs. Wait until a series of people finish their lives on it and have offspring. Only the first stage has been completed.

2. The second phase is a small batch, and it should be an experiment with thousands of people. It will be decades before there are more successful data.

People who go to experiments in the early days will bring enough things from the earth in case of accidents. For example: 1, basic necessities. 2, self-defense weapons and medicine. 3. Production tools. 4. Energy.

Third, the third step is mass immigration.

You can calculate that it will take two hundred years to be orderly and smooth.